本帖最后由 eurekahmily 于 2013-10-29 22:26 编辑
马头星云和猎户座大星云
Image Credit & Copyright: Roberto Colombari & Federico Pelliccia
Explanation: The dark Horsehead Nebula and the glowing Orion Nebula are contrasting cosmic vistas. Adrift 1,500 light-years away in one of the night sky's most recognizable constellations, they appear in opposite corners of the above stunning mosaic. The familiar Horsehead nebula appears as a dark cloud, a small silhouette notched against the long red glow at the lower left. Alnitak is the easternmost star in Orion's belt and is seen as the brightest star to the left of the Horsehead. Below Alnitak is the Flame Nebula, with clouds of bright emission and dramatic dark dust lanes. The magnificent emission region, the Orion Nebula (aka M42), lies at the upper right. Immediately to its left is a prominent reflection nebula sometimes called the Running Man. Pervasive tendrils of glowing hydrogen gas are easily traced throughout the region.
7M大图3543 × 2249 pixels下载：
http://apod.nasa.gov/apod/image/ ... _colombari_3543.jpg
黑暗的马头星云和发光的猎户座大星云是宇宙中一道美丽景色。距离我们大约1500光年，是夜空中最容易识别的星座。在这张惊艳的照片中，他们各自占据了一个对角。在照片左下角，猎户座大星云红色辉光的映衬下，熟悉的马头星云看起来像一团乌云，留下一个小小的剪影。参宿一是猎户座腰带上最东端的恒星，也是马头星云左侧最亮的星。参宿一下面是发光星云，有着明亮的发光云气和黑暗的尘埃带。猎户座大星云（M42）位于右上角，一片壮观的发射区域。它左侧紧挨着一个夺目反射星云，有时被称为跑步的人。发光的氢气云弥漫在整个天区。
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